RMI app - java.rmi.ConnectException

[Lukas Stephienn]

Hi
I built an app based on RMI. Client (which is applet) connects to a server and sends it's own stub so the server could also invoke client methods.

Everything works fine as long as client machine has public IP.
But when he has not:

java.rmi.ConnectException: Connection refused to host: <here is client IP>;
nested exception is: java.net.ConnectException: Connection timed out
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:574)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:171)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:94) ...

This exception occurs when server for the first time tries to invoke remote method of the client.

Is there any solution for this problem?
Thanks in advance.

[Nathan Pruett]

Sun's RMI FAQ has a section on workarounds for firewalls.